Class: QgsRasterShader¶
-
class
qgis.core.
QgsRasterShader
¶ Bases:
sip.wrapper
Interface for all raster shaders.
Methods
Returns the maximum value for the raster shader.
Returns the minimum value for the raster shader.
- rtype
QgsRasterShaderFunction
Reads shader state from an XML element.
Sets the maximum
value
for the raster shader.Sets the minimum
value
for the raster shader.A public method that allows the user to set their own shader
function
.Generates a new RGBA value based on one input
value
.Writes shader state to an XML element.
-
maximumValue
(self) → float¶ Returns the maximum value for the raster shader.
See also
See also
- Return type
float
-
minimumValue
(self) → float¶ Returns the minimum value for the raster shader.
See also
See also
- Return type
float
-
rasterShaderFunction
(self) → QgsRasterShaderFunction¶ - Return type
-
readXml
(self, elem: QDomElement)¶ Reads shader state from an XML element.
- Parameters
elem (QDomElement) –
-
setMaximumValue
(self, value: float)¶ Sets the maximum
value
for the raster shader.See also
See also
- Parameters
value (float) –
-
setMinimumValue
(self, value: float)¶ Sets the minimum
value
for the raster shader.See also
See also
- Parameters
value (float) –
-
setRasterShaderFunction
(self, function: QgsRasterShaderFunction)¶ A public method that allows the user to set their own shader
function
.Note
Raster shader takes ownership of the shader function instance
- Parameters
function (QgsRasterShaderFunction) –
-
shade
(self, value: float) → Tuple[bool, int, int, int, int]¶ Generates a new RGBA value based on one input
value
.- Parameters
value (float) – The original value to base a new RGBA value on
returnRedValue – The red component of the new RGBA value
returnGreenValue – The green component of the new RGBA value
returnBlueValue – The blue component of the new RGBA value
- Returns
True
if the return values are valid otherwiseFalse
returnAlpha: The alpha component of the new RGBA value
shade(self, redValue: float, greenValue: float, blueValue: float, alphaValue: float) -> Tuple[bool, int, int, int, int] Generates a new RGBA value based on an original RGBA value.
- Parameters
redValue – The red component of the original value to base a new RGBA value on
greenValue – The green component of the original value to base a new RGBA value on
blueValue – The blue component of the original value to base a new RGBA value on
alphaValue – The alpha component of the original value to base a new RGBA value on
returnRedValue – The red component of the new RGBA value
returnGreenValue – The green component of the new RGBA value
returnBlueValue – The blue component of the new RGBA value
- Return type
Tuple[bool, int, int, int, int]
- Returns
True
if the return values are valid otherwiseFalse
returnAlpha: The alpha component of the new RGBA value
-
writeXml
(self, doc: QDomDocument, parent: QDomElement)¶ Writes shader state to an XML element.
- Parameters
doc (QDomDocument) –
parent (QDomElement) –